Piston



(NOLMO deL) E. H. ODERMAN.

PISTON.

No 560,918. Patented May 26, 1896.

FIG.

alumni o7 an filtto m wuwm ANDREW B.GRA')MM. PHOTO-UTND.WA 5NINGTON,Dfi.

UNITED STATES PATENT OFFICE.

ERIE H. ODERLWIAN, OF W'AYNESBOROUGH, PENNSYLVANIA.

PISTON.

SPECIFICATION forming part of Letters Patent No. 560,918, dated May 26,1896. Application filed February 14,1896. Serial No. 579,200. (Nomodel.)

To all whom it may concern.-

Be it known that I, ERIE H. ODERMAN, a citizen of the United States,residing at WVaynesborough, in the county of Franklin and State ofPennsylvania, have invented certain new and useful Improvements inPistons; and I do hereby declare the following to be a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same.

This invention relates to pistons; and it consists in the novelconstruction and combination of the parts hereinafter fully describedand claimed.

In the drawings, Figure 1 is a sectional view of the piston. Fig. 2 is aplan View of the piston.

The piston is formed of two separate disks A and A, mounted on apiston-rod B. Each disk A and A is provided with packing-rings a ofapproved construction. The two disks are slidable upon the piston-rodand are pressed apart by a spring 0. A single spiral spring is shown;but any approved form of spring or springs may be used. The pistonrod isprovided with a collar 0, having a beveled shoulder or seat 0. Thecollar 0 is slidable in a cylindrical recess D in the disk A, and isprovided with packing or packingrings cl. The end of the piston-rod isscrewthreaded and is provided with jam-nuts e, which are slidable in arecess E in the disk A. The disk A is provided with a cylinder f, andthe disk A has a cylindrical projection f, which is slidable in thecylinder f, and is provided with packing-rings g of approvedconstruction.

II is a cap secured to the disk A and covering the recess E and the endof the pistonrod.

This piston requires a minimum amount of clearance between it and theends of the cylinder in which it works, as should either disk strike anend of the cylinder it is forced back against the pressure of the spring0, and the end of the cylinder is not broken by the force of the blow.When single acting, only one of the disks need be slidable.

What I claim is-- 1. The combination, with a piston comprising two disksof equal diameter, and a spring normally holding the said disks apart,of a single piston-rod operatively connected to bot-h of the said disks,said rod being provided with means for normally holding the said disksat a prearranged maximum distance apart, substantially as set forth.

2. The combination, with a piston comprising two disks of equaldiameter, and means for normally holding the two disks apart andpermitting one to approach the other when it strikes an obstruction, ofa single piston-rod operatively connected to both of the said disks,said rod being provided with means for normally holding the said disksat a prearranged maximum distance apart, substantially as set forth.

3. A piston comprising two disks, one of the said disks having acylindrical projection slidable in a cylinder formed in the other saiddisk, and a-spring normally holding the said disks apart.

4. The combination, with a piston rod provided with a collar andjam-nuts, of a piston comprising two disks each provided with a recessand slidable on the piston-rod between the said collar and jam-nuts, aspring normally holding the said disks apart, and a cap secured to onedisk over the end of the piston-rod, substantially as set forth.

In testimony whereof I affix my signature in presence of two witnesses.

ERIE I-LODERMAN. Witnesses:

GUSTAV R. BROSTROM, J. H. STONER.

